Automatic shears



Aug. 26,'y 1947. w. J. LANDEN AUTOMATIC SHEAR` Filed oct. 51, 1944 NN. am MN. hw 9m,

Patented Aug. 26, 1947 UNITED STATES-PATENT OFFICE 7 claims. v,(l. .so-228) This invention has to do with motor actuated shears. This type of shears or cutters is broadly old, and the present invention is directed to improvements on that type as now known to me.

It has, among other objects, the provision of motor operated shears of simple, ruggedconstruction; a type which may be produced at reasonable cost; in which the parts are readily accessible for replacement or repairs, and which rmay be easily handled and manipulated by the user. Furthermore, it provides a construction in which the number of parts going to make up the complete device are few; which lend themselves to easy production without the need of complicated mechanical operations, and the assembly of which parts into the final structure can be done without the necessity of employing highly skilled labor.

The device consists generally of a two-part housing so shaped and assembled as to form a readily manipulable handle for the user to grasp in operating the tool; a motor of any suitable or desired type enclosed in the housing; motor driven shear operating means of simple construction and easy of assembly set up completely within the housing, and cooperating shear blades disposed outside of the housing in such relation thereto as to permit the cutting operation to be readily carried-out.

In the drawings herewith is illustrated one embodiment of the device, and in said drawings:

Figure 1 is a longitudinal sectional view through the tool, the shear blades being in elevation.

Figure 2 is a transverse sectional view on substantially the line 2-2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a transverse sectional View on substantially the line 3-3 of Figure 1 looking in the direction of the arrows.

Reference will be made to the drawing by numbers, and the same numbers designate the same parts in the several views.

A hollow housing I of substantially cylindrical form and having an open rear end is provided. This housing may be made of any suitable material, metal being preferable, although this housing and other housing parts might be formed of a suitable plastic. The housing Ill has a longitudinal aperture or slot I0' (Fig. 2) so that the housing I0 can expand for a purpose presently to be described, and this aperture will be closed in assembling the device by a strip I2, and to that stripmay be secured a fixed shear blade I I. The shear blade I I is here shown as formed inte-l gral with the strip I2. Telescoping with and nested in the housing I0 is a second housing I3 which is engaged with the exterior housing I0 by inserting it at the rear open end of housing I0 and telescoping it to the position shown in Figure l. The longitudinal aperture in the exterior housing permits the exterior housing I0 to expand as the inner housing I3 is forced into it. The strip I'2 is secured in place to close the aperfl ture in the housing I0 by means of screws 2B which engage the second housing I3, as Vshown in Figure 1.n The housing Ill has at its rear open end a lip` I4 which, as here shown, extends approximately half way around the open mouth of the split housing I0 as shown in Figure 1, and this lip engages a complementary recess in the housing I3, there being suicient elasticity in the housing Ill to permit the lip I4 and recess to snap. into and out of engagement when the l, parts are shifted. The two housings may additionally be held together in any suitable manner as by the removable screw I5, so that the exterior housing Il) and the housing I3 may be readily separated by removing the screw I5 and disengaging the inner housing from the lip I4.

The housing I3 is split longitudinally as indicated at IB, and is provided at its forward end with the bearing I1, and at its rear end with the bearing I1. These bearings support the motor 'shaft I8 driven by a motor of any suitable type,

a conventional electric motor being here shown,

although any suitable type of motor may be used.v

If an electric motor is used, it and its power leads will be fully insulated from the other parts The motor casing or shell I9 is made in two parts held together in any suitable manner as by screws 20, so that the motor casingmay be readily separated for installation or removal of the motor and its associated parts for repair or replacements.

The drive shaft I8 may be a direct continuation of a motor shaft having the desired R. P. M., or any usual reducing gearing may be provided, and, as stated, any suitable motor may be used.

' A direct drive electric motor, o-r one having reend, as shown, and extend over the operating parts and in close relation to the pivotal point 26 of the blades so as to guard against contact with the shear actuating parts of the mechanism within the housing. The housing I is preferably provided With an aperture 26 in such relation to the bearing II and the eccentric 22, that 1ubricant can be readily applied to the parts when needed.

The xed shear blade I I Will preferably be carried by the removableclosure strip'IZ', which strip is contoured to coincide with the'contour of the exterior casing and, as stated, held in place by the screws 20, which engage the interior housing I3. With this construction the closure strip I2 and the fixed blade II carried thereby can be removed for sharpening or for replacement vs'ri'tl'i-v out the necessity of taking down' the whole device. Where the fixed blade II is formed integral with the closure strip I2 as here shown, itA Will be understood that the metal of the blade will be of a character and temper to provide a suitable cutting edge.

The forward end ofthe exteriorv housing' IU is open at 29 as shown, and' the front an'drear ends of the interior housing I3 have apertures 30 as shovvn. The casing ofthe motor I9'v is provided with air openings 3l so that' thereisl an opportunity for free flovv of air through the device when operating, andheating of the parts is avoidedy or minimized;

In order to damp vibration of the'sh'aft I8, there is preferably provided a member 32 i'ixed on the shaft,l I8,` just in advance` of the motor casing I9, and on this member 3:2` is: looselyv mounted theV spri-ngheld ring 33,= the' springs 34;' holding the ring y33; elastically with respect tothe inner nous# ing I3, which housingA has projections 35' to engage the outer ends of the springs.- With this damping; device,` tendency of theshaft- I8 to vi'- brate When the lmotor and itsv shaft are' rotated is very materially reduced, and' a smooth action of the rotating parts is secured;

It will be seen that the: housing containing the operating parts ,is very compactJ and systematically disposed With respectjto. the' cutting blades. This is of advantage, in that the lixed blade; the cuttingedge of-which parallely to the longitudinal axis of the housing, may beconveniently moved Nalon-,gva supportiver surface or table on which material to, be out is placed; andthe device can be manipulated at a convenient angle relative to the' Work. vAs pointed out,v the xed blade' carried by the strip can be removed, and' Where integral vvith/ thestrip vvillI b e removed with such strip, and the movable blade with itseccentric head canV also be' removed with the xed blade through the` opening/Hat the frontof the housing IU, and all of this can be accomplished without dismantling the other parts.A V llurthenl by providing the telescoping housing I3: which i-sfnested within the outer housing Ij,1 such housing I3, With its' contained parts, may be readily vvith'- dravvn andthe split interior housing I3j and the split motor housing to the parts for the ments. Y

This disclosure, itis to necessary repairsor replacebe understood', is illustrative and notrestrictive. n It will no dou-bt suggest mechanical variations to others.U ,Such'variations asare within the range of mechanical skill are to be regarded as within the range of my invention, which is not, limited to the specificy disclosure, except as by the terms of the appended claims.

I 9.' thenl separated for access I claim:

1. A device of the class described comprising an exterior housing having a longitudinal aperture in its Wall,`a closure strip for the aperture, a shear blade rigidly supported relative to said housing, an interior housing telescoped in said exterior housing, the longitudinal aperture in the exterior housing allowing the same to expand when the interior housing is forced into engagement therewith, a motor and drive shaft mounted for rotation in said interior housing, a movable shear blade pivoted in operative relation to said xed shear blade, and blade actuating means vv'ithin said exterior housing connecting said drive shaftwith said movable shear blade.

2.7A device of the class described comprising an exteriorl housing having a longitudinal aperture in its Wall, a closure strip for the aperture, a shear blade rigidly supported by said strip, an interior housing telescoped in said exterior housing, means for securing said strip to said interior housing, a motor and driveshaft mounted for rotation insaid interior housing, a movable' shear bladel pivoted in operative relation to said xed shear blade, and blade actuating means connecting said drive shaft withv said movable shear blade.l Y

3. A device ofV the class described comprising an exterior housing having a longitudinal apertureV in its vvall, a closureV stripyfor the aperture, a'; shear blade rigidly supported by and integral with said strip, an interior housing telescoped in said exterior housing, means for securing said closurestrip to said interior housing, a motor anddrive shaft mountedfor' rotation in said interior housing, amovable shear blade pivoted inoperative relation to said `fixed' shear ture in it'srw'all, a closure strip for the aperture',V

a shear blade rigidly supported by and' integral with saidv strip; an interior housing telescoped in said exterior housing, means' for securing said closure s'trip'to said interior housing, av motor and drive shaft mounted vfor rotation in saidjinterior housing, a movable shear blade pivoted on said rigid blade in operative: relation to said fixed shear blade, and blade actuating means Within. said e'iterior` housing conectings'aid drive shaftwith' sai'dlm'o'vable shear blade.` Y

5. A device'-.ofV the class describedcomprisingl an exterior housing, a shear blade rigidly supported relative to' said housing, aniterior housing telescoped in said exterior'housing, spring fastening means automatically engageable' and disengageabl'e' on Shifting' of said telescoping housings to secure or releasel them,- a` motor andv drive shaft mounted for rotationir'rsaid inte'rin-` housing,- a movable shear blade pivoted in operative relation to said fixed she'arblade; andi blade actuatingmea'nslvvithinsaid exterior housing connecting` said .drive shaft with'. saidmovable shear blade'.`

6; A; device'I of thecla'ss' described comprising an exterior housing', a shear blade rigidly slipported `relative to said hou'sii'ig, anv ir'ite'rir` h'using telescoped in saidiexterior housing, spring rib and vrec'essifasteni'ng means on sai'dhousing auto'- matically engageable -and-disengageable on shifting` ofnsiaid telescoping housings to'secure or releasel them, a motor andrd'rive shaft mounted for rotationin saidinterior housing, a movableY shear blade pivoted in operative relation to said xed shear blade, and blade actuating means within said exterior housing connecting said drive shaft with said movable shear blade.

7. A device of the class described, comprising an exterior housing having a slot, a fixed shear blade adjacent the slot in said exterior housing, an interior housing telescoped in said exterior housing, means for detachably connecting the xed shear blade to the interior housing, a motor and drive shaft mounted for rotation in said interior housing, a movable shear blade pivoted in operative relation to said fixed shear blade, and blade actuating means Within said exterior housing connecting said drive shaft with said movable shear blade, the parts being constructed and arranged so that the fixed blade may be removed for replacement or sharpening Without disturbing the other parts of the shears.

WILLIAM J. LANDEN.

REFERENCES CITED The following references are or record in the f le of this patent:

UNTTED STATES PATENTS 

